Re: RFC: renameat2 emulation

[Jason Thorpe <thorpej%me.com@localhost>]

> On Sep 14, 2024, at 4:17 AM, Shiv <coderaccords%gmail.com@localhost> wrote:
> 
> As part of my GSoC project, me and my mentor have
> decided to extend support for renameat2 in the compat_linux.
> We have decided to enable support for 2 newer flags, namely
> RENAME_NOREPLACE and RENAME_EXCHANGE. There are
> 2 particular questions, on which we would like to gather communities
> insights:

Will also be responding to Taylor’s response to this message, but I wanted to add one bit of info here:

> 2. RENAME_EXCHANGE requires atomic swap of filenames and the
> filetypes need not be the same. Can any of the existing VFS operations
> be used to do so? And if this should be done in VFS layer or any specific
> support is expected from the file system to implement this?

The underlying file system must support this explicitly.  This ensures that the rename-swap will be atomic.

-- thorpej